K-hindered decay of a six-quasiparticle isomer in Hf176

G. Mukherjee, P. Chowdhury, F. G. Kondev, P. M. Walker, G. D. Dracoulis, R. D'Alarcao, I. Shestakova, K. Abu Saleem, I. Ahmad, M. P. Carpenter, A. Heinz, R. V F Janssens, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, I. Wiedenhoever, D. M. Cullen, C. Wheldon, D. L. BalabanskiM. Danchev, T. M. Goon, D. J. Hartley, L. L. Riedinger, O. Zeidan, M. A. Riley, R. A. Kaye, G. Sletten

    Research output: Contribution to journalArticlepeer-review


    The structure and decay properties of high-K isomers in Hf176 have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new ΔK=8 decay branch, from a Kπ=22⊃-, six-quasiparticle, isomeric (t1/2=43μs) state at 4864 keV to the 20⊃- state of a Kπ=14⊃- band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (fν=3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a Kπ=16⊃+ intrinsic state, is reassigned as the Jπ=16⊃+ member of the band based on the Kπ=15⊃+ state at 3080 keV. The systematics of fν values as a function of the degree of forbiddenness is discussed in light of this change. © 2010 The American Physical Society.
    Original languageEnglish
    Article number054316
    JournalPhysical Review C - Nuclear Physics
    Issue number5
    Publication statusPublished - 29 Nov 2010


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